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https://issues.apache.org/jira/browse/HADOOP-4137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brian Bockelman resolved HADOOP-4137.
-------------------------------------
Resolution: Duplicate
> NPE in GangliaContext.xdr_string (GangliaContext.java:195)
> ----------------------------------------------------------
>
> Key: HADOOP-4137
> URL: https://issues.apache.org/jira/browse/HADOOP-4137
> Project: Hadoop Core
> Issue Type: Bug
> Components: metrics
> Affects Versions: 0.18.0, 0.18.1
> Reporter: Michael Bieniosek
> Attachments: hadoop_ganglia_npe-4137.patch,
> hadoop_ganglia_npe-4137.patch
>
>
> Exception in thread "Timer thread for monitoring dfs"
> java.lang.NullPointerException
> at
> org.apache.hadoop.metrics.ganglia.GangliaContext.xdr_string(GangliaContext.java:195)
> at
> org.apache.hadoop.metrics.ganglia.GangliaContext.emitMetric(GangliaContext.java:138)
> at
> org.apache.hadoop.metrics.ganglia.GangliaContext.emitRecord(GangliaContext.java:123)
> at
> org.apache.hadoop.metrics.spi.AbstractMetricsContext.emitRecords(AbstractMetricsContext.java:304)
> at
> org.apache.hadoop.metrics.spi.AbstractMetricsContext.timerEvent(AbstractMetricsContext.java:290)
> at
> org.apache.hadoop.metrics.spi.AbstractMetricsContext.access$000(AbstractMetricsContext.java:50)
> at
> org.apache.hadoop.metrics.spi.AbstractMetricsContext$1.run(AbstractMetricsContext.java:249)
> at java.util.TimerThread.mainLoop(Unknown Source)
> at java.util.TimerThread.run(Unknown Source)
> It looks like this caused the datanode to hang, though I accidentally killed
> the datanode before I could dump its stack.
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